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Applicative Study(Part I):The Excellent Conditions to Remove in Batch Direct Textile Dyes(Direct Red,Direct Blue and Direct Yellow)from Aqueous Solutions by adsorption processes on Low-Cost Chitosan Films under Different Conditions

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Advances in Chemical Engineering and Science 2014年第4期4卷 454-469页

作者： Vito Rizzi Alessandra Longo Paola Fini Paola Semeraro Pinalysa Cosma Esther Franco Rocío García Marcela Ferrándiz Estrella Núnez JoséAntonio Gabaldón Isabel Fortea Enrique Pérez Miguel Ferrándiz Universitàdegli Studi“Aldo Moro”di Bari Dip.ChimicaBariItaly Consiglio Nazionale delle Ricerche CNR-IPCF UOS BariBariItaly Biotechnology Department Textile Industry Research Association(AITEX)AlcoySpain Departamento Ciencia y Tecnología de Alimentos Universidad Católica San Antonio de MurciaGuadalupeMurciaSpain Colorprint Fashion SLAvda.Fco.Vitoria LaportaMuro de Alcoy(Alicante)Spain

In recent years the development of chitosan (CH) based materials as useful adsorbent polymeric matrices is an expanding field in the area of adsorption science. Even though CH has been successfully used for dye removal from aqueous solutions due to its low cost, no considerations have been made about, for example, the effect of changing the pH of chitosan hydrogelor about the dehydrating effect of Ethanol (EtOH) treatment of chitosan film on the dyes removal from water. Consequently in our laboratory we carried out a study focusing the attention, mainly, on the potential use of CH films under different conditions, such as reducing the intrinsic pH, increasing the hydrophobic character by means of ethanol treatment and neutralization of CH films to improve their absorption power. Textile anionic dyes named Direct Red 83:1, Direct Yellow 86 and Direct Blue 78 have been studied with the aim of reducing the contact time of CH film in waste water improving the bleaching efficiency. Neutralized acid CH film and longtime dehydrated one result to be the better films in dye removal from water. Also the reduction of the CH solution acidity during the film preparation determines the decreasing of the contact time improving the results. The effect of initial dye concentration has been examined and the amount of dye adsorption in function of time t, qt (mg/cm2), for each analyzed film has been evaluated comparing the long term effect with the decoloration rate. A linear form of pseudo-first-order Lagergren model has been used and described. The best condition for removing all examined dyes from various dye solutions appears to be the dehydration of a novel projected CH film obtained by means of the film immersion in EtOH for 4 days. Also CH films prepared by well-known literature procedure and neutralized with NaOH treatment appear having an excellent behavior, however the film treatment requires a large quantity of water and time.

关键词： Chitosan Film Textile Dyes adsorption processes Wastewater

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Emerging contaminants as global environmental hazards.A bibliometric analysis

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Emerging Contaminants 2020年第1期6卷 179-193页

作者： Howard Ramírez-Malule Diego H.Quinones-Murillo Diego Manotas-Duque Escuela de Ingeniería Química Universidad del ValleA.A.25360CaliColombia Grupo de Procesos Químicos y Bioquímicos Sostenibles Facultad de IngenieríaUniversidad del Atlantico081007Puerto ColombiaColombia Escuela de Ingeniería Industrial Universidad del ValleA.A.25360CaliColombia

This paper presents a bibliometric analysis of peer-reviewed scientific literature on emerging contaminants published from 2000 through 2019.A total of 4968 documents(among research articles and review papers)collected from Scopus database were analyzed using the VOSviewer 1.6.11 *** to our results,this topic has been capturing researchers’attention over the years and the latter five years of the analysis timespan corresponds to the period of highest scientific productivity on this subject,when a 70.4%of all analyzed documents were *** States,China,Spain,Italy and Canada were the tope5 most productive countries in terms of number of published works,while Science of the Total Environment,Chemosphere,Environmental Science and Pollution Research,Environmental Pollution and Water Research stood out as the journals with the highest number of publications,gathering a 31%of papers and 34%of all *** to the frequency of author keywords,the main specific research topic assessed by the researchers are the occurrence of pharmaceuticals and personal care products in wastewater and the removal of such pollutants by the application of adsorption and advanced oxidation processes.

关键词： Emerging contaminants Bibliometric analysis Pharmaceuticals Water pollution Advanced oxidation process adsorption processes Scientific output

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